Memory heat maps

[dirkwhoffmann]

I've just come across this new web port of vAmiga by @coppenheimer, which looks very promising.

One of its standout features is memory heat maps, a feature that could greatly enhance vAmiga's capabilities if supported natively.

There are two main reasons for this project:

1. Heat maps look cool 😎
2. At some point, I'd like to add run-ahead to vAmiga as I've implemented it in VirtualC64 5.0, which will be released soon as a beta. A fast cloning logic for virtual machines is a central part of the run-ahead implementation. In the C64 case, I simply copy over memory. In the Amiga case, a smarter memory logic is needed to determine which memory areas are dirty. With some extra effort, this tracking logic should be able to create nice heat maps as a side effect.